You can just submit a ticket with the list of usernames or emails, the new information, and the date you need it updated if you don't mind. We'll be able to help you make the adjustments as soon as possible, although an early request, like a week or two, would be ideal. We may be unable to accommodate last-minute urgent needs since we may have a lot of tasks to complete.
Hint: We're developing a simple method to update all corporate information. Please be patient.